Add default window sizes

Author: kblaschke

src/gui/FileChooser.cpp

@@ -96,6 +96,7 @@ bool FileChooser::Draw()
 
     ImGui::OpenPopup(_title.c_str());
 
+    ImGui::SetNextWindowSize(ImVec2(800, 600), ImGuiCond_FirstUseEver);
     if (ImGui::BeginPopupModal(_title.c_str(), &_visible, ImGuiWindowFlags_NoCollapse))
     {
         DrawNavButtons();

src/gui/HelpWindow.cpp

@@ -31,6 +31,7 @@ void HelpWindow::Draw()
     constexpr ImGuiTabBarFlags tabBarFlags = ImGuiTabBarFlags_None;
     constexpr ImGuiTableFlags tableFlags = ImGuiTableFlags_Borders | ImGuiTableFlags_RowBg;
 
+    ImGui::SetNextWindowSize(ImVec2(1000, 600), ImGuiCond_FirstUseEver);
     if (ImGui::Begin("Help", &_visible, windowFlags))
     {
         if (ImGui::BeginTabBar("Help Topics", tabBarFlags))

src/gui/SettingsWindow.cpp

@@ -44,6 +44,7 @@ void SettingsWindow::Draw()
     }
     windowId.append("###Settings");
 
+    ImGui::SetNextWindowSize(ImVec2(1050, 550), ImGuiCond_FirstUseEver);
     if (ImGui::Begin(windowId.c_str(), &_visible, windowFlags))
     {
         if (ImGui::BeginTabBar("projectM Settings", tabBarFlags))