egui_web: constrain the IME text agent to the canvas for single-line text input widget #870
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Closes #869
I didn't restrict the X position of the text agent in #830, so I missed the problem with single line text input as well.
To make it more perfect, I think that the X position of the text agent needs to be limited by the right edge of the text input widget that is currently being entered.
However, I am not familiar with the structure of egui and do not know how to get the currently inputting widget in this code.
Hence, this PR is a tentatively fix for this problem.