IDE: Fixed loading of user key schemes.

1. Fix access violation on closing IDE when loaded user key scheme is present.
2. Correctly load user key scheme on IDE (re)start.
3. Search user key schemes in `userkeyschemes` subdirectory of Lazarus configuration directory.

Based on patch by Dean Mustakinov, part of issue #40559.

(cherry picked from commit 18bec6520a)

ide/editoroptions.pp

@@ -5088,10 +5088,12 @@ begin
       XMLConfig.GetValue('EditorOptions/Display/DoNotWarnForFont', '');
 
     // Key Mappings options
+    LoadCustomKeySchemas;
     fKeyMappingScheme :=
       XMLConfig.GetValue('EditorOptions/KeyMapping/Scheme', KeyMapSchemeNames[kmsLazarus]);
-    fKeyMap.LoadFromXMLConfig(XMLConfig
-      , 'EditorOptions/KeyMapping/' + fKeyMappingScheme + '/');
+    if not fKeyMap.LoadFromXMLConfig(XMLConfig
+      , 'EditorOptions/KeyMapping/' + fKeyMappingScheme + '/') then
+      fKeyMappingScheme := KeyMapSchemeNames[kmsLazarus];
 
     // Color options
     for i := 0 to HighlighterList.Count - 1 do

ide/keymapping.pp

@@ -74,6 +74,8 @@ const
   ecIdePSyncroOutOffset = ecSynPSyncroEdNextCell - ecIdePSyncroEdOutNextCell;
   ecIdePSyncroSelOffset = ecSynPSyncroEdStart    - ecIdePSyncroEdSelStart;
 
+  KeyMappingSchemeConfigDirName = 'userkeyschemes';
+
 type
   //---------------------------------------------------------------------------
   // TKeyCommandCategory is used to divide the key commands in handy packets
@@ -3570,8 +3572,11 @@ begin
   FileVersion:=XMLConfig.GetValue(Path+'Version/Value',0);
   ExtToolCount:=XMLConfig.GetValue(Path+'ExternalToolCount/Value',0);
 
+  Result:=false;
+
   if FileVersion>5 then begin
     Cnt:=XMLConfig.GetValue(Path+'Count',0);
+    Result:=Cnt>0;
     // load all keys from the config, this may be more than the current relations
     // for example because the command is not yet registered.
     for a:=1 to Cnt do begin
@@ -3632,6 +3637,7 @@ begin
         Relations[a].ShortcutA:=Relations[a].DefaultShortcutA;
         Relations[a].ShortcutB:=Relations[a].DefaultShortcutB;
       end else begin
+        Result:=true;
         p:=1;
         Key1:=word(ReadNextInt);
         Shift1:=FixShift(IntToShiftState(ReadNextInt));
@@ -3657,7 +3663,6 @@ begin
       end;
     end;
   end;
-  Result:=true;
 end;
 
 function TKeyCommandRelationList.SaveToXMLConfig(
@@ -4367,7 +4372,7 @@ begin
   if not Assigned(dst) then Exit;
 
   fn := FindAllFiles(
-    IncludeTrailingPathDelimiter(dir)+'keyschema', '*.xml', false);
+    IncludeTrailingPathDelimiter(dir)+KeyMappingSchemeConfigDirName, '*.xml', false);
 
   if not Assigned(fn) then Exit;
   try
@@ -4420,11 +4425,9 @@ end;
 initialization
   RegisterKeyCmdIdentProcs(@IdentToIDECommand,
                            @IDECommandToIdent);
+  // CustomKeySchemas should be freed in TMainIDE.Destroy destructor
   CustomKeySchemas := TStringList.Create;
   CustomKeySchemas.OwnsObjects := true;
 
-finalization
-  CustomKeySchemas.Free;
-
 end.
 

ide/main.pp

@@ -1790,6 +1790,7 @@ begin
   FreeThenNil(MiscellaneousOptions);
   FreeThenNil(EditorOpts);
   IDECommandList := nil;
+  FreeThenNil(CustomKeySchemas);
   FreeThenNil(IDECommandScopes);
   // free control selection
   FreeThenNil(TheControlSelection);