[Mono-bugs] [Bug 403122] New: Scrollbar: crashing and bad maths

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=403122


           Summary: Scrollbar: crashing and bad maths
           Product: Mono: Class Libraries
           Version: 1.9.0
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Windows.Forms
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: andyhume32 at yahoo.co.uk
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


I noticed that the LargeChange value is bounded to the Maximum value, it should
be bounded to the length of the scrollbar, i.e. Max-Min+fudge.  For instance
with give Min,Max pair, should see:
  -50,  50 -> maximum LargeChange = 101
  199, 200 -> maximum LargeChange = 2
  200, 200 -> maximum LargeChange = 1

But instead bounded to 51, 201, 201, respectively.  

And behaviour is thus wrong too, for instance in case 1 that Scrollbar tab
won't move by arrow or bar click, the tab can be dragged, but value is always
-49.



Also scrollbar is crashable in various circumstances.  For instance:

Defaults values are: min,max: 0,100; changes: 1,10
Set Maximum to 8.
Click the scrollbar's right (/down) arrow.  Crash:

[[
Unhandled Exception: System.ArgumentOutOfRangeException: '-1' is not a valid
value for 'Value'. 'Value' should be between 'Minimum' and 'Maximum' [@0->-1
0<->8 1_9]
Parameter name: Value
at System.Windows.Forms.ScrollBar.set_Value (int) [0x00167] in
D:\cygwin\usr\src\mono\mcs\class\Managed.Windows.Forms\System.Windows.Forms\ScrollBar.cs:623
at System.Windows.Forms.ScrollBar.SmallIncrement () [0x00031] in
D:\cygwin\usr\src\mono\mcs\class\Managed.Windows.Forms\System.Windows.Forms\ScrollBar.cs:1301
at System.Windows.Forms.ScrollBar.OnMouseUpSB
(object,System.Windows.Forms.MouseEventArgs) [0x000b7] in
D:\cygwin\usr\src\mono\mcs\class\Managed.Windows.Forms\System.Windows.Forms\ScrollBar.cs:1187
]]


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