fix(android): the folder panel closes when you tap beside it

It stayed open until something was chosen, and there was no way to change your mind. A full-screen scrim now dims the background and takes the outside tap; the hardware back button closes the panel before anything else, which is what it is expected to do while something is open.

The list also scrolls: eight folders fit, twenty would have run off the screen. Rows are placed by coordinate inside the scroll box, with no alignment at all - the only arrangement FMX has not surprised me with today.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

mainApk.pas

@@ -741,6 +741,14 @@ procedure TForm8.OnHardwareBack(Sender: TObject; var Key: Word;
   var KeyChar: WideChar; Shift: TShiftState);
 begin
   if Key <> vkHardwareBack then Exit;
+  // Le panneau des dossiers se ferme avant tout le reste : c'est ce que le
+  // bouton retour est cense faire d'abord quand quelque chose est ouvert.
+  if FFolderPanel <> nil then
+  begin
+    FreeAndNil(FFolderPanel);
+    Key := 0;
+    Exit;
+  end;
   if FLayDetail.Visible then
   begin
     ShowList;
@@ -1181,33 +1189,59 @@ procedure TForm8.OnFolderTap(Sender: TObject);
 var
   I: Integer;
   LRow: TRectangle;
-  LH: Single;
+  LCard: TRectangle;
+  LBody: TVertScrollBox;
+  LH, LWanted, LMax: Single;
 begin
   Touch;
   FreeAndNil(FFolderPanel);
   if Length(FFolderNames) < 2 then Exit;   // rien a choisir
 
-  LH := 54;
+  LH := 52;
-  // PLACEMENT EXPLICITE, aucune convention d'alignement : l'ordre d'empilement
+
-  // de FMX s'est revele instable des qu'on detruit et recree des enfants.
+  // Voile plein ecran : il assombrit le fond ET recoit le clic exterieur.
-  FFolderPanel := Surface(FLayList);
+  // Sans lui le panneau restait ouvert tant qu'on n'avait pas choisi - il
-  FFolderPanel.Align := TAlignLayout.None;
+  // faut toujours pouvoir renoncer.
-  FFolderPanel.SetBounds(16, 66, FLayList.Width - 32,
+  FFolderPanel := TRectangle.Create(FLayList);
-                         Length(FFolderNames) * LH + 12);
+  FFolderPanel.Parent := FLayList;
-  FFolderPanel.Fill.Color := COL_SURFACE;
+  FFolderPanel.Align := TAlignLayout.Contents;
+  FFolderPanel.Fill.Color := TAlphaColor($99000000);
+  FFolderPanel.Stroke.Kind := TBrushKind.None;
+  FFolderPanel.OnClick := OnFolderPick;
+  FFolderPanel.Tag := -1;            // -1 : renoncer, garder le choix courant
+
+  LWanted := Length(FFolderNames) * LH + 12;
+  LMax := FLayList.Height - 140;
+  if LWanted > LMax then LWanted := LMax;
+
+  LCard := Surface(FFolderPanel);
+  LCard.Align := TAlignLayout.None;
+  LCard.SetBounds(16, 66, FLayList.Width - 32, LWanted);
+
+  // Defilant, car une longue liste de dossiers sortirait de l'ecran. Les
+  // lignes y sont POSEES A LA COORDONNEE, sans alignement : c'est ce qui rend
+  // l'ordre independant des conventions de FMX, instables des qu'on detruit
+  // et recree des enfants.
+  LBody := TVertScrollBox.Create(LCard);
+  LBody.Parent := LCard;
+  LBody.Align := TAlignLayout.Client;
+  LBody.Margins.Rect := RectF(6, 6, 6, 6);
+  LBody.ShowScrollBars := False;
 
   for I := 0 to High(FFolderNames) do
   begin
-    LRow := FlatButton(FFolderPanel, FFolderNames[I], OnFolderPick, I = FFolderSel);
+    LRow := FlatButton(LBody, FFolderNames[I], OnFolderPick, I = FFolderSel);
     LRow.Align := TAlignLayout.None;
-    LRow.SetBounds(6, 6 + I * LH, FFolderPanel.Width - 12, LH - 6);
+    LRow.SetBounds(0, I * LH, LCard.Width - 24, LH - 6);
     LRow.Tag := I;
   end;
 end;
 
 procedure TForm8.OnFolderPick(Sender: TObject);
 begin
-  if Sender is TRectangle then FFolderSel := TRectangle(Sender).Tag;
+  // Tag -1 : le voile, donc un clic a cote. On ferme sans rien changer.
+  if (Sender is TRectangle) and (TRectangle(Sender).Tag >= 0) then
+    FFolderSel := TRectangle(Sender).Tag;
   SetButtonText(FBtnFolder, FFolderNames[FFolderSel]);
   FreeAndNil(FFolderPanel);
   OnSearchChanged(nil);