SetFilename() file dialogs with sensible defaults

Went through first the diff of the referenced commit,
then all instances of "Create(Open|Save)FileDialog";
added SetFilename() calls where a default exists.

This has been previously removed in
6b5db58
Closes #538

src/file.cpp

@@ -893,11 +893,13 @@ bool SolveSpaceUI::ReloadAllLinked(const Platform::Path &saveFile, bool canCance
             }
         } else if(linkMap.count(g.linkFile) == 0) {
             // The file was moved; prompt the user for its new location.
-            switch(LocateImportedFile(g.linkFile.RelativeTo(saveFile), canCancel)) {
+            const auto linkFileRelative = g.linkFile.RelativeTo(saveFile);
+            switch(LocateImportedFile(linkFileRelative, canCancel)) {
                 case Platform::MessageDialog::Response::YES: {
                     Platform::FileDialogRef dialog = Platform::CreateOpenFileDialog(SS.GW.window);
                     dialog->AddFilters(Platform::SolveSpaceModelFileFilters);
                     dialog->ThawChoices(settings, "LinkSketch");
+                    dialog->SetFilename(linkFileRelative);
                     if(dialog->RunModal()) {
                         dialog->FreezeChoices(settings, "LinkSketch");
                         linkMap[g.linkFile] = dialog->GetFilename();
@@ -974,6 +976,7 @@ bool SolveSpaceUI::ReloadLinkedImage(const Platform::Path &saveFile,
         Platform::FileDialogRef dialog = Platform::CreateOpenFileDialog(SS.GW.window);
         dialog->AddFilters(Platform::RasterFileFilters);
         dialog->ThawChoices(settings, "LinkImage");
+        dialog->SetFilename(filename->RelativeTo(saveFile));
         if(dialog->RunModal()) {
             dialog->FreezeChoices(settings, "LinkImage");
             *filename = dialog->GetFilename();

src/solvespace.cpp

@@ -599,6 +599,7 @@ void SolveSpaceUI::MenuFile(Command id) {
             Platform::FileDialogRef dialog = Platform::CreateSaveFileDialog(SS.GW.window);
             dialog->AddFilters(Platform::RasterFileFilters);
             dialog->ThawChoices(settings, "ExportImage");
+            dialog->SetFilename(SS.saveFile);
             if(dialog->RunModal()) {
                 dialog->FreezeChoices(settings, "ExportImage");
                 SS.ExportAsPngTo(dialog->GetFilename());
@@ -610,6 +611,7 @@ void SolveSpaceUI::MenuFile(Command id) {
             Platform::FileDialogRef dialog = Platform::CreateSaveFileDialog(SS.GW.window);
             dialog->AddFilters(Platform::VectorFileFilters);
             dialog->ThawChoices(settings, "ExportView");
+            dialog->SetFilename(SS.saveFile);
             if(!dialog->RunModal()) break;
             dialog->FreezeChoices(settings, "ExportView");
 
@@ -633,6 +635,7 @@ void SolveSpaceUI::MenuFile(Command id) {
             Platform::FileDialogRef dialog = Platform::CreateSaveFileDialog(SS.GW.window);
             dialog->AddFilters(Platform::Vector3dFileFilters);
             dialog->ThawChoices(settings, "ExportWireframe");
+            dialog->SetFilename(SS.saveFile);
             if(!dialog->RunModal()) break;
             dialog->FreezeChoices(settings, "ExportWireframe");
 
@@ -644,6 +647,7 @@ void SolveSpaceUI::MenuFile(Command id) {
             Platform::FileDialogRef dialog = Platform::CreateSaveFileDialog(SS.GW.window);
             dialog->AddFilters(Platform::VectorFileFilters);
             dialog->ThawChoices(settings, "ExportSection");
+            dialog->SetFilename(SS.saveFile);
             if(!dialog->RunModal()) break;
             dialog->FreezeChoices(settings, "ExportSection");
 
@@ -655,6 +659,7 @@ void SolveSpaceUI::MenuFile(Command id) {
             Platform::FileDialogRef dialog = Platform::CreateSaveFileDialog(SS.GW.window);
             dialog->AddFilters(Platform::MeshFileFilters);
             dialog->ThawChoices(settings, "ExportMesh");
+            dialog->SetFilename(SS.saveFile);
             if(!dialog->RunModal()) break;
             dialog->FreezeChoices(settings, "ExportMesh");
 
@@ -666,6 +671,7 @@ void SolveSpaceUI::MenuFile(Command id) {
             Platform::FileDialogRef dialog = Platform::CreateSaveFileDialog(SS.GW.window);
             dialog->AddFilters(Platform::SurfaceFileFilters);
             dialog->ThawChoices(settings, "ExportSurfaces");
+            dialog->SetFilename(SS.saveFile);
             if(!dialog->RunModal()) break;
             dialog->FreezeChoices(settings, "ExportSurfaces");
 
@@ -879,6 +885,7 @@ void SolveSpaceUI::MenuAnalyze(Command id) {
             Platform::FileDialogRef dialog = Platform::CreateSaveFileDialog(SS.GW.window);
             dialog->AddFilters(Platform::CsvFileFilters);
             dialog->ThawChoices(settings, "Trace");
+            dialog->SetFilename(SS.saveFile);
             if(dialog->RunModal()) {
                 dialog->FreezeChoices(settings, "Trace");