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When computing a potential match for a tiled window, there is a chance we face the case where 2 windows really complement each other's tile mode (i.e. left and right) but they have different sizes, and their borders don't really touch each other. In that case, the current code would mistakenly assume they're tile matches, and would resize them with either a hole or an overlapping area between windows. This is clearly a misbehavior that is a consequence of the previous assumptions pre-resizable tiles. This patch adapts the tile match algorithm to also consider the touching edges when computing the matching tile, unless: * the window is not currently tiled (for example when computing the tile preview) * the window is currently resized in tandem with an existing tile match https://bugzilla.gnome.org/show_bug.cgi?id=645153 bar