feat(autofill): "Clear the field before typing" setting (default ON)

The Ctrl+A + Del sent before each field misbehaves on targets where Ctrl+A
isn't select-all (terminals, some remote desktops). New synced setting
(autofillClearField, Settings > Autofill) gates it: JS appends clear=0 to
cmd://autofill/execute when off; ExecuteAutofill wraps the three
SendSelectAllAndDelete calls behind AClearFirst. Absent param = ON, so
existing behavior is unchanged.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

delphi-backend/Source/PM.Bridge.pas

@@ -171,9 +171,10 @@ type
     // the caller trays it after the fill.
     // Returns False when nothing was typed: elevated target (UIPI would
     // silently drop the keystrokes) or focus never left our own window.
+    // AClearFirst: send Ctrl+A + Del before each field (user setting).
     function ExecuteAutofill(ATargetHWND: HWND;
       const AUsername, APassword: string; AUsernameOnly: Boolean = False;
-      ARestoreAfter: Boolean = False): Boolean;
+      ARestoreAfter: Boolean = False; AClearFirst: Boolean = True): Boolean;
     property SecureClipboard: TSecureClipboard read FSecureClipboard;
     property TrayAdded: Boolean read FTrayAdded;
     property AutofillRegistered: Boolean read FAutofillRegistered;
@@ -1187,10 +1188,21 @@ end;
 
 function TPMBridge.ExecuteAutofill(ATargetHWND: HWND;
   const AUsername, APassword: string; AUsernameOnly: Boolean = False;
-  ARestoreAfter: Boolean = False): Boolean;
+  ARestoreAfter: Boolean = False; AClearFirst: Boolean = True): Boolean;
 const
   MinimizeSettleMs   = 80;
   FocusSettleDelayMs = 120;
+
+  // Ctrl+A + Del to empty the target field — skipped when the user turned
+  // "Clear the field before typing" off (Ctrl+A isn't select-all everywhere:
+  // terminals, some remote desktops).
+  procedure ClearFieldIfWanted;
+  begin
+    if not AClearFirst then Exit;
+    SendSelectAllAndDelete;
+    Sleep(60);
+  end;
+
 var
   OwnFormHwnd: HWND;
 begin
@@ -1233,28 +1245,24 @@ begin
   // no password. Used by the quick-search right-click / Shift+Enter path.
   if AUsernameOnly then
   begin
-    SendSelectAllAndDelete;
+    ClearFieldIfWanted;
-    Sleep(60);
     SendUnicodeString(AUsername);
     Exit;
   end;
 
   if AUsername = '' then
   begin
-    SendSelectAllAndDelete;
+    ClearFieldIfWanted;
-    Sleep(60);
     SendUnicodeString(APassword);
     Exit;
   end;
 
-  SendSelectAllAndDelete;
+  ClearFieldIfWanted;
-  Sleep(60);
   SendUnicodeString(AUsername);
   Sleep(200);
   SendVKey(VK_TAB);
   Sleep(200);
-  SendSelectAllAndDelete;
+  ClearFieldIfWanted;
-  Sleep(60);
   SendUnicodeString(APassword);
 end;
 

delphi-backend/UMainForm.pas

@@ -105,6 +105,9 @@ type
     // True when the pending autofill should type ONLY the username (quick
     // search "autofill username" — right-click / Shift+Enter in fill mode).
     FAutofillPendingUserOnly: Boolean;
+    // Send Ctrl+A + Del before typing each field (user setting, default ON;
+    // OFF for targets where Ctrl+A isn't select-all — terminals, RDP).
+    FAutofillPendingClear: Boolean;
     // Created dynamically in FormCreate so the directive can pick either
     // TTMSFNCWebBrowser or TTMSFNCEdgeWebBrowser at compile time without
     // needing two .fmx variants. Aligned to Client to fill the remaining
@@ -897,6 +900,7 @@ begin
     FAutofillPendingHWND := FAutofillTargetHWND;
     FAutofillPendingHide := GetParam('hide_after') = '1';
     FAutofillPendingUserOnly := GetParam('field') = 'user';
+    FAutofillPendingClear := GetParam('clear') <> '0';   // absent = ON
     FAutofillTargetHWND := 0;
 
     // Small timer so SetForegroundWindow has time to take effect before
@@ -1449,7 +1453,7 @@ procedure TMainForm.AutofillTimerTick(Sender: TObject);
 var
   TargetHwnd: HWND;
   PendingUser, PendingPass: string;
-  HideAfter, UserOnly: Boolean;
+  HideAfter, UserOnly, ClearFirst: Boolean;
   ForegroundAfter: HWND;
 begin
   TargetHwnd  := FAutofillPendingHWND;
@@ -1457,11 +1461,13 @@ begin
   PendingPass := FAutofillPendingPass;
   HideAfter   := FAutofillPendingHide;
   UserOnly    := FAutofillPendingUserOnly;
+  ClearFirst  := FAutofillPendingClear;
   FAutofillPendingHWND := 0;
   FAutofillPendingUser := '';
   FAutofillPendingPass := '';
   FAutofillPendingHide := False;
   FAutofillPendingUserOnly := False;
+  FAutofillPendingClear := False;
 
   TTimer(Sender).Enabled := False;
   TTimer(Sender).Free;
@@ -1470,7 +1476,7 @@ begin
   // (quick-search beside the target), it stays visible during the fill; if it
   // started hidden, the MinimizeToTray below re-hides it anyway.
   var LFillOk := FBridge.ExecuteAutofill(TargetHwnd, PendingUser, PendingPass,
-    UserOnly, not HideAfter);
+    UserOnly, not HideAfter, ClearFirst);
   ForegroundAfter := GetForegroundWindow;
   LogLine(Format('Autofill executed — target=%s, foreground_after=%s, ok=%s',
     [IntToHex(TargetHwnd, 8), IntToHex(ForegroundAfter, 8),

index.html

@@ -628,6 +628,20 @@
                         <span class="toggle-slider"></span>
                     </label>
                 </div>
+                <div class="setting-row">
+                    <span>
+                        Clear the field before typing
+                        <small class="setting-hint">
+                            Sends Ctrl+A + Del to empty the target field first.
+                            Disable for apps where Ctrl+A isn't "select all"
+                            (terminals, some remote desktops).
+                        </small>
+                    </span>
+                    <label class="toggle">
+                        <input type="checkbox" id="settingAutofillClear">
+                        <span class="toggle-slider"></span>
+                    </label>
+                </div>
                 <div id="settingAutofillHotkeysRow" style="margin-top:8px">
                     <div class="setting-row">
                         <span style="font-size:12px;color:var(--text-dim)">

js/app.js

@@ -141,7 +141,8 @@ const Bridge = (() => {
             cmd('cmd://autofill/execute?username=' + encodeURIComponent(username) +
                 '&password=' + encodeURIComponent(password) +
                 (hideAfter ? '&hide_after=1' : '') +
-                (field === 'user' ? '&field=user' : ''));
+                (field === 'user' ? '&field=user' : '') +
+                (state.autofillClearField ? '' : '&clear=0'));
         },
 
         // Ask Delphi to bring the main window to front (used when the
@@ -643,6 +644,7 @@ const state = {
     quickUnlockEnabled: localStorage.getItem('quickUnlockEnabled') === '1',
     recoveryConfigured: false,   // refreshed by refreshRecoveryStatus on Settings open
     autofillEnabled: localStorage.getItem('autofillEnabled') !== '0', // default ON
+    autofillClearField: localStorage.getItem('autofillClearField') !== '0', // default ON
     // Hotkey combos. Each combo = { ctrl, shift, alt, win, key }.
     // key is the uppercase character or VK label ('A'..'Z', '0'..'9',
     // 'F1'..'F12'). Default: Ctrl+Shift+L / Ctrl+Shift+P. Combos are
@@ -6341,6 +6343,7 @@ function openSettings() {
     $('#settingFaviconsRow').style.display          = Bridge.active ? '' : 'none';
     $('#settingFaviconActionsRow').style.display    = Bridge.active ? 'flex' : 'none';
     $('#settingAutofill').checked  = state.autofillEnabled;
+    $('#settingAutofillClear').checked = state.autofillClearField;
     $('#settingAutofillRow').style.display = Bridge.active ? '' : 'none';
     // Hotkey capture buttons — labels reflect current combos.
     $('#settingAutofillFullCombo').textContent = autofillComboLabel(state.autofillHotkeyFull);
@@ -6750,6 +6753,9 @@ const SYNCED_SETTING_KEYS = [
     // Unlock method (pw / pin / both). The PIN blob itself is device-local
     // DPAPI so this synced setting only carries the user's preferred mode.
     'unlockMode',
+    // Send Ctrl+A + Del before typing each autofill field (default ON).
+    // OFF for targets where Ctrl+A isn't select-all (terminals, RDP).
+    'autofillClearField',
 ];
 
 // Sets `data-editor-position` on <body> so CSS can swap the slideover
@@ -6830,6 +6836,9 @@ async function loadServerSettings() {
                 case 'unlockMode':
                     localStorage.setItem('unlockMode', String(v || 'pw'));
                     break;
+                case 'autofillClearField':
+                    localStorage.setItem('autofillClearField', v ? '1' : '0');
+                    break;
             }
         });
         // Apply visual settings immediately.
@@ -7660,6 +7669,11 @@ async function init() {
         const lbl = autofillComboLabel(state.autofillHotkeyFull);
         toast(state.autofillEnabled ? ('Autofill enabled (' + lbl + ')') : 'Autofill disabled');
     });
+    $('#settingAutofillClear').addEventListener('change', e => {
+        state.autofillClearField = e.target.checked;
+        localStorage.setItem('autofillClearField', e.target.checked ? '1' : '0');
+        saveServerSettings();
+    });
 
     // ---- Hotkey capture buttons ----
     // Click → button label becomes "Press combo…" → next keydown captures.