A line gets dash pattern when spaces are overlapping the like

[munetoshi]

When a text is overlaps a line, the overlapped part gets hidden. However, the line is not hidden completely when spaces overlap a line. The actual behavior is making a dash pattern.

     ┌────────────┐ text               
─────┼─aaaaaaaaaa─┼────────────────────
     └────────────┘                    
                                       
                                       
    ┌─────────────┐ spaces             
────┤ ─ ─ ─ ─ ─ ─ ├────────────────────
    └─────────────┘                    
                                       
                                       
    ┌─────────────┐ empty              
────┼─────────────┼────────────────────
    └─────────────┘                    

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