Make image file extension filtering case-insensitive

Replace wxImage::GetImageExtWildcard() with a new FILEEXT::ImageFileWildcard()
function that uses KiCad's formatWildcardExt() to generate case-insensitive
file patterns on GTK (e.g., [pP][nN][gG] instead of just png).

This allows selecting image files with uppercase extensions like .JPG or .PNG
in the Place Image dialogs across eeschema, pcbnew, pl_editor, and
bitmap2component.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/21254

bitmap2component/bitmap2cmp_frame.cpp

@@ -399,8 +399,7 @@ void BITMAP2CMP_FRAME::OnLoadFile()
         path = m_mruPath;
 
     wxFileDialog fileDlg( this, _( "Choose Image" ), path, wxEmptyString,
-                          _( "Image Files" ) + wxS( " " )+ wxImage::GetImageExtWildcard(),
-                          wxFD_OPEN | wxFD_FILE_MUST_EXIST );
+                          FILEEXT::ImageFileWildcard(), wxFD_OPEN | wxFD_FILE_MUST_EXIST );
 
     if( fileDlg.ShowModal() != wxID_OK )
         return;

common/wildcards_and_files_ext.cpp

@@ -570,6 +570,12 @@ wxString FILEEXT::JpegFileWildcard()
 }
 
 
+wxString FILEEXT::ImageFileWildcard()
+{
+    return _( "Image files" ) + AddFileExtListToFilter( { "png", "jpg", "jpeg", "bmp", "gif" } );
+}
+
+
 wxString FILEEXT::HotkeyFileWildcard()
 {
     return _( "Hotkey file" ) + AddFileExtListToFilter( { HotkeyFileExtension } );

eeschema/tools/sch_drawing_tools.cpp

@@ -70,7 +70,7 @@
 #include <import_gfx/dialog_import_gfx_sch.h>
 #include <sync_sheet_pin/sheet_synchronization_agent.h>
 #include <string_utils.h>
-//#include <wildcards_and_files_ext.h>
+#include <wildcards_and_files_ext.h>
 #include <wx/filedlg.h>
 #include <wx/msgdlg.h>
 
@@ -1184,7 +1184,7 @@ int SCH_DRAWING_TOOLS::PlaceImage( const TOOL_EVENT& aEvent )
                 m_toolMgr->RunAction( ACTIONS::selectionClear );
 
                 wxFileDialog dlg( m_frame, _( "Choose Image" ), m_mruPath, wxEmptyString,
-                                  _( "Image Files" ) + wxS( " " ) + wxImage::GetImageExtWildcard(), wxFD_OPEN );
+                                  FILEEXT::ImageFileWildcard(), wxFD_OPEN );
 
                 bool cancelled = false;
 

include/wildcards_and_files_ext.h

@@ -286,6 +286,7 @@ public:
     static wxString WorkbookFileWildcard();
     static wxString PngFileWildcard();
     static wxString JpegFileWildcard();
+    static wxString ImageFileWildcard();
     static wxString HotkeyFileWildcard();
     static wxString JobsetFileWildcard();
 

pagelayout_editor/pl_editor_frame.cpp

@@ -843,8 +843,7 @@ DS_DATA_ITEM* PL_EDITOR_FRAME::AddDrawingSheetItem( int aType )
     case DS_DATA_ITEM::DS_BITMAP:
     {
         wxFileDialog fileDlg( this, _( "Choose Image" ), m_mruImagePath, wxEmptyString,
-                              _( "Image Files" ) + wxS( " " ) + wxImage::GetImageExtWildcard(),
-                              wxFD_OPEN );
+                              FILEEXT::ImageFileWildcard(), wxFD_OPEN );
 
         if( fileDlg.ShowModal() != wxID_OK )
             return nullptr;

pcbnew/tools/drawing_tool.cpp

@@ -56,6 +56,7 @@
 #include <view/view.h>
 #include <widgets/appearance_controls.h>
 #include <widgets/wx_infobar.h>
+#include <wildcards_and_files_ext.h>
 #include <wx/filedlg.h>
 #include <wx/msgdlg.h>
 
@@ -749,8 +750,7 @@ int DRAWING_TOOL::PlaceReferenceImage( const TOOL_EVENT& aEvent )
                 m_toolMgr->RunAction( ACTIONS::selectionClear );
 
                 wxFileDialog dlg( m_frame, _( "Choose Image" ), wxEmptyString, wxEmptyString,
-                                  _( "Image Files" ) + wxS( " " ) + wxImage::GetImageExtWildcard(),
-                                  wxFD_OPEN );
+                                  FILEEXT::ImageFileWildcard(), wxFD_OPEN );
                 bool         cancelled = false;
 
                 RunMainStack(