OPENGL_GAL, draw bitmap: Rebuild the bitmap cache if the bitmap itself was rotated.

Fixes #12378
https://gitlab.com/kicad/code/kicad/issues/12378
Fix also a Coverity warning.

common/gal/opengl/opengl_gal.cpp

@@ -113,10 +113,16 @@ GLuint GL_BITMAP_CACHE::RequestBitmap( const BITMAP_BASE* aBitmap )
 
     if( it != m_bitmaps.end() )
     {
-        // A bitmap is found in cache bitmap.
-        // Ensure the associated texture is still valid (can be destroyed somewhere)
-        if( glIsTexture( it->second.id ) )
+        // A bitmap is found in cache bitmap. Ensure the associated texture
+        // is still valid.
+        // It can be destroyed somewhere or the corresponding bitmap can be
+        // modifed (rotated)
+        if( ( it->second.w == aBitmap->GetSizePixels().x ) &&
+            ( it->second.h == aBitmap->GetSizePixels().y ) &&
+            glIsTexture( it->second.id ) )
+        {
             return it->second.id;
+        }
 
         // else if not valid, it will be recreated.
     }

pcb_calculator/calculator_panels/panel_cable_size.cpp

@@ -104,6 +104,7 @@ PANEL_CABLE_SIZE::PANEL_CABLE_SIZE( wxWindow* parent, wxWindowID id, const wxPoi
     m_updatingResistanceDc = false;
     m_updatingRVdrop = false;
     m_updatingPower = false;
+    m_updatingConductorMaterialResitivity = false;
 
     m_imperial = false;