I've been attempting to implement a Memo type field in an RTC page without resorting to an Add In Control as this must work with both the Web and Sharepoint clients. It seems completely bizarre that RTC relies upon WinForms instead of WPF effectively crippling client-side add-in capability but putting this issue aside I set to work with a workaround of my own.
I got 99% of the way there with a regular field with it's source set to a bigtext variable and a bit of IN/OUT stream trickery from a BLOB column in the triggers, switching the regular textbox control to multiline mode fills the height properly. The text is stored and retrieved as expected however regardless of which container I put it in I cannot force the textbox to fill the width of the page.
This appears to be a bug that's plagued RTC since the 2009 as I have tested there also, with the only difference being that the height of the textbox on 2009 RTC was previously crippled but now appears to be healthier, unfortunately whenever that got fixed, the issue of width was overlooked in 2013 RTM.
Using the width setting on the field properties is illegal for bigtext and seemingly useless for text variables so the question remains. How can I force a single textbox to fill the width of it's parent container?
UPDATE
This problem gets worse when the web client is involved. It does not appear to honour the multiline attribute of the the text field.
Where can I submit this as a bug to Microsoft?
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