Documentations for Github users. Metrics: Fixed display of NavRectRel, added display of ParentWindow.

.github/issue_template.md

@@ -1,12 +1,30 @@
 You may use the Issue Tracker to ask for help and submit bug reports, feature requests or suggestions. 
+
 PLEASE CAREFULLY READ THIS DOCUMENT before doing so:
 [CONTRIBUTING.md](https://github.com/ocornut/imgui/blob/master/.github/CONTRIBUTING.md).
 
-You can include code snippets using `Begin()` for short in-line snippets, or:
-```cpp
-ImGui::Begin("Hello");
-ImGui::ThisIsMoreCode();
-```
-For multiline snippets.
+SELECT "PREVIEW CHANGES" TO TURN THE URL ABOVE INTO A CLICKABLE LINK.
+
+(Delete everything above this section before submitting your issue. Please read the CONTRIBUTING.md file!)
+
+----
+
+- Version/Branch of Dear ImGui:
+
+XXX
+
+- Back-end/Renderer/OS: _(if the question is related to inputs or rendering, otherwise delete this section)_
+
+XXX
+
+- My Issue/Question: _(please provide context)_
+
+- Standalone, minimal, complete and verifiable example: _(see CONTRIBUTING.md)_
+```
+ImGui::Begin("Example Bug");
+MoreCodeToExplainMyIssue();
+ImGui::End();
+```
+
+- Screenshots/Video _(you can drag files here)_
 
-(Clear this form before submitting your issue. Please read the CONTRIBUTING.md file!)