UI: only let the drive letters appear in This PC

requested in #515 to be more consistent with windows explorer

the search paths were moved to Quick Access for this

this will also basically remove the This PC section from linux and mac for now (maybe the root and home should be there?)

src/modules/ui/FileDialog.cpp

@@ -340,10 +340,6 @@ void FileDialog::quickAccessPanel(video::OpenFileMode type, const core::String &
 			}
 			quickAccessEntry(index++, type, dir, contentRegionWidth, folderNames[n], folderIcons[n]);
 		}
-		ImGui::TreePop();
-	}
-
-	if (ImGui::TreeNode(_("This PC"))) {
 		const io::Paths& paths = _app->filesystem()->paths();
 		for (const core::String& path : paths) {
 			const core::String& absPath = _app->filesystem()->absolutePath(path);
@@ -352,12 +348,18 @@ void FileDialog::quickAccessPanel(video::OpenFileMode type, const core::String &
 			}
 			quickAccessEntry(index++, type, absPath, contentRegionWidth, nullptr, ICON_LC_FOLDER);
 		}
-		for (const core::String &path : _app->filesystem()->otherPaths()) {
-			quickAccessEntry(index++, type, path, contentRegionWidth);
-		}
 		ImGui::TreePop();
 	}
 
+	if (!_app->filesystem()->otherPaths().empty()) {
+		if (ImGui::TreeNode(_("This PC"))) {
+			for (const core::String &path : _app->filesystem()->otherPaths()) {
+				quickAccessEntry(index++, type, path, contentRegionWidth);
+			}
+			ImGui::TreePop();
+		}
+	}
+
 	if (ImGui::TreeNode(_("Bookmarks"))) {
 		if (ImGui::BeginDragDropTarget()) {
 			if (const ImGuiPayload * payload = ImGui::AcceptDragDropPayload(FILEDIALOGBOOKMARKDND)) {