Bug 14907 - Extremely slow processing with very long line
Summary: Extremely slow processing with very long line
Alias: None
Product: Xamarin Studio
Classification: Desktop
Component: Text Editor ()
Version: unspecified
Hardware: PC Mac OS
: Low enhancement
Target Milestone: master
Assignee: Mike Krüger
: 19439 ()
Depends on:
Reported: 2013-09-21 19:38 UTC by Jérémie Laval
Modified: 2015-11-19 09:22 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Jérémie Laval 2013-09-21 19:38:11 UTC
When scrolling to/opening a document that contains a long line (e.g. in my case a long single-line verbatim string) the IDE beachball for a while.

A kill -QUIT make it look like it's stuck on Pango:

"GUI Thread"  at <unknown> <0xffffffff>
  at (wrapper managed-to-native) Pango.Layout.pango_layout_get_size (intptr,int&,int&) <IL 0x00025, 0xffffffff>
  at Pango.Layout.GetSize (int&,int&) <IL 0x00008, 0x0001b>
  at Mono.TextEditor.TextViewMargin.CreateLinePartLayout (Mono.TextEditor.Highlighting.ISyntaxMode,Mono.TextEditor.DocumentLine,int,int,int,int,int) [0x0080f] in /Users/builder/data/lanes/monodevelop-lion-master/df750340/source/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/Gui/TextViewMargin.cs:1070
  at Mono.TextEditor.TextViewMargin.CreateLinePartLayout (Mono.TextEditor.Highlighting.ISyntaxMode,Mono.TextEditor.DocumentLine,int,int,int,int) [0x0000c] in /Users/builder/data/lanes/monodevelop-lion-master/df750340/source/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/Gui/TextViewMargin.cs:1371
  at Mono.TextEditor.TextViewMargin.GetLayout (Mono.TextEditor.DocumentLine) [0x00053] in /Users/builder/data/lanes/monodevelop-lion-master/df750340/source/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/Gui/TextViewMargin.cs:1473
  at Mono.TextEditor.TextArea.RenderMargins (Cairo.Context,Cairo.Context,Cairo.Rectangle) [0x0010a] in /Users/builder/data/lanes/monodevelop-lion-master/df750340/source/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/Gui/TextArea.cs:1742
  at Mono.TextEditor.TextArea.OnExposeEvent (Gdk.EventExpose) [0x00103] in /Users/builder/data/lanes/monodevelop-lion-master/df750340/source/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/Gui/TextArea.cs:1825
  at Gtk.Widget.exposeevent_cb (intptr,intptr) <IL 0x00014, 0x00061>
  at (wrapper native-to-managed) Gtk.Widget.exposeevent_cb (intptr,intptr) <IL 0x00024, 0xffffffff>
  at <unknown> <0xffffffff>
  at (wrapper managed-to-native) Gtk.Application.gtk_main () <IL 0x00022, 0xffffffff>
  at Gtk.Application.Run () <IL 0x00000, 0x0000b>
  at MonoDevelop.Ide.IdeApp.Run () [0x00000] in /Users/builder/data/lanes/monodevelop-lion-master/df750340/source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide/Ide.cs:387
  at MonoDevelop.Ide.IdeStartup.Run (MonoDevelop.Ide.MonoDevelopOptions) [0x007ad] in /Users/builder/data/lanes/monodevelop-lion-master/df750340/source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide/IdeStartup.cs:291
  at MonoDevelop.Ide.IdeStartup.Main (string[]) [0x00086] in /Users/builder/data/lanes/monodevelop-lion-master/df750340/source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide/IdeStartup.cs:538
  at Xamarin.Startup.MainClass.Main (string[]) [0x00002] in /Users/builder/data/lanes/monodevelop-lion-master/df750340/source/md-addins/Xamarin.Startup/Main.cs:10
  at (wrapper runtime-invoke) <Module>.runtime_invoke_int_object (object,intptr,intptr,intptr) <IL 0x0005c, 0xffffffff>
Comment 1 Mike Krüger 2013-09-22 00:15:19 UTC
Avoid very long lines - it's a general bottelneck.
Comment 2 Jérémie Laval 2013-09-23 11:57:00 UTC
Don't put as a wontfix, a text editor shouldn't care about that stuff. It can be marked as low priority/enhancement instead.
Comment 3 Mike Krüger 2013-09-23 12:00:08 UTC
no - it's a wontfix because it's a limitation in our technical decision. I know about limits of our technology - other pango editors (like gedit) have the same issue with long lines.

If you want to track these limits use trello - it's no place in the bug tracker for this kind of stuff IMO. That'll be solved when we switch the technology - it's not a 'todo' item on it's own.
Comment 4 Mike Krüger 2013-09-23 12:02:24 UTC
Hm, however I wanted to try out a work around with different 'partitions' for this issue - I reopen that one.
Comment 5 Mike Krüger 2014-05-01 00:21:50 UTC
*** Bug 19439 has been marked as a duplicate of this bug. ***
Comment 6 xamarin-release-manager 2015-11-19 09:22:36 UTC
Fixed in version (roslyn)

Author: Mike Kr??ger
Commit: c9ba6f0fed6acff166a1f2256af7785ecbaba194 (mono/monodevelop)