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Return pressed in the the begining of the first cell will insert new block
before the table (and move the caret there) if none is already there,
otherwise it will act as normal return. This behaviour is taken from
LibreOffice Writer.

Don't insert BR after the table, but insert the same block (but empty)
as current block. Also when we are inserting new table from empty block
replace it with newly created table (otherwise insert the table below
it).

A runtime warning like this:

   evolution-mail-WARNING **: Failed to find parent <object>
   for '.message.mixed.1.mbox.0.rfc822.attachment-bar' - no ID set?

could be shown when a message in the preview had a message attachment,
which had also an attachment.

The reason for it was a use of the same variable name in the 'for' body
as in the parent block, which, even the element was found, didn't set
the parent block's variable, thus it behaved like nothing was found.

The GtkCellRendererPixbuf didn't show the left-most icon, I do not know
why it doesn't like pixbuf pre-scaled to required size, but it doesn't.

When inserting a new table into contenteditable element the width of the cells
is nearly zero and the td { min-height } doesn't work so put unicode zero width
space before each cell.

Also don't jump around UI when pressing Shift + Tab outside of table.

It will be enabled again after the 3.16 is branched so we can improve
it.

It closed immediately, causing no way to select any color.

Instead use the WebKit's HTML representation of tabulator.

Bug 745551 - Pasting text from gnome-terminal with concatenated whitespace and tabulators, some whitespace occurrences get removed

The problem was the the code expected that the matched pattern will be
just the spaces or tabulators nor both of them at the same time. As
a fix we need to process the matched pattern characters one by one.

Also when deciding whether to preserve the block (line) we need to
operate with a string that already has the tabulators replaced.

The N_() only marks the string as "to be translated", but doesn't
translate it, it's the _() used for.